LED power supply device

摘要

An LED power supply device disclosed in the present specification includes a DC dimmer circuit that performs dimming control of an LED such that the higher a reference voltage variably controlled according to a dimmer signal is, the smaller a current flowing in the LED is. This configuration makes it possible to achieve fine dimming control.

主权项

1. An LED lighting device comprising:
LED; a detection voltage generation portion that generates a detection voltage according to an output current flowing in the LED; a reference voltage generation portion that generates a reference voltage according to a dimming signal input from the outside of the LED lighting device for adjusting the brightness of the LED; an amplifier that generates a feedback signal according to a difference between the detection voltage and the reference voltage; and a driver that adjusts the output current according to the feedback signal, wherein the higher the brightness of the LED according to the dimming signal is, the lower the reference voltage becomes, and the lower the brightness of the LED according to the dimming signal is, the higher the reference voltage becomes.